Selective Raman Scattering Detection of the Dirac Node and the Anti-node of the Spin Density Wave Gap and Magnetic Excitations in BaFe2As2
The electronic and magnetic excitations at the spin density wave (SDW) transition are investigated by Raman scattering. The multi-orbital electronic states induce the Dirac nodes in the SDW gap. The excitations near the nodes and anti-nodes are separately detected in accordance with the two-orbital...
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| Veröffentlicht in: | Journal of superconductivity and novel magnetism 2013-04, Vol.26 (4), p.1179-1183 |
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| container_title | Journal of superconductivity and novel magnetism |
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| creator | Sugai, S. Mizuno, Y. Watanabe, R. Kawaguchi, T. Takenaka, K. Ikuta, H. Kiho, K. Nakajima, M. Lee, C. H. Iyo, A. Eisaki, H. Uchida, S. |
| description | The electronic and magnetic excitations at the spin density wave (SDW) transition are investigated by Raman scattering. The multi-orbital electronic states induce the Dirac nodes in the SDW gap. The excitations near the nodes and anti-nodes are separately detected in accordance with the two-orbital tight-binding model. The exchange interactions are found to be given by the second derivative of the total energy with respect to the angle of the moment from two-magnon scattering. The two-magnon peak has the large spectral weight above twice the maximum energy of magnon. It is interpreted by the magnetic self-energy of the electron spectral function in the localized spin model or particle-hole excitations in the itinerant spin model. |
| doi_str_mv | 10.1007/s10948-012-1966-6 |
| format | Article |
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H.</creatorcontrib><creatorcontrib>Iyo, A.</creatorcontrib><creatorcontrib>Eisaki, H.</creatorcontrib><creatorcontrib>Uchida, S.</creatorcontrib><title>Selective Raman Scattering Detection of the Dirac Node and the Anti-node of the Spin Density Wave Gap and Magnetic Excitations in BaFe2As2</title><title>Journal of superconductivity and novel magnetism</title><addtitle>J Supercond Nov Magn</addtitle><description>The electronic and magnetic excitations at the spin density wave (SDW) transition are investigated by Raman scattering. The multi-orbital electronic states induce the Dirac nodes in the SDW gap. The excitations near the nodes and anti-nodes are separately detected in accordance with the two-orbital tight-binding model. The exchange interactions are found to be given by the second derivative of the total energy with respect to the angle of the moment from two-magnon scattering. The two-magnon peak has the large spectral weight above twice the maximum energy of magnon. 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| subjects | Characterization and Evaluation of Materials Condensed Matter Physics Condensed matter: electronic structure, electrical, magnetic, and optical properties Derivatives Electron states Exact sciences and technology Exchange and superexchange interactions Excitation Excitation spectra Magnetic Materials Magnetic properties and materials Magnetically ordered materials: other intrinsic properties Magnetism Methods of electronic structure calculations Original Paper Physics Physics and Astronomy Raman scattering Spectra Spin density waves Spin waves Strongly Correlated Systems Superconductivity |
| title | Selective Raman Scattering Detection of the Dirac Node and the Anti-node of the Spin Density Wave Gap and Magnetic Excitations in BaFe2As2 |
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